I guess my error rate is actually 0%, since I've never voted -- on anything. My preference is to simply ++ those nodes I believe are worthwhile, either because they ask good questions or present good information. Thus far, I've always found enough good posts to use all of my votes on. ;) It's better, IMNSHO, to encourage our fellow monks who post positive contributions this way than to worry about "punishing" the negative contributions via --.